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Make mid block optional for flax UNet #7083

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Merged
merged 2 commits into from
Mar 8, 2024
Merged

Make mid block optional for flax UNet #7083

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ec4d3d6
make mid block optional for flax UNet
mar-muel Feb 25, 2024
d8b904a
make style
mar-muel Mar 7, 2024
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31 changes: 20 additions & 11 deletions src/diffusers/models/unets/unet_2d_condition_flax.py
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Original file line number Diff line number Diff line change
Expand Up @@ -75,6 +75,8 @@ class FlaxUNet2DConditionModel(nn.Module, FlaxModelMixin, ConfigMixin):
The tuple of downsample blocks to use.
up_block_types (`Tuple[str]`, *optional*, defaults to `("FlaxUpBlock2D", "FlaxCrossAttnUpBlock2D", "FlaxCrossAttnUpBlock2D", "FlaxCrossAttnUpBlock2D")`):
The tuple of upsample blocks to use.
mid_block_type (`str`, *optional*, defaults to `"UNetMidBlock2DCrossAttn"`):
Block type for middle of UNet, it can be one of `UNetMidBlock2DCrossAttn`. If `None`, the mid block layer is skipped.
block_out_channels (`Tuple[int]`, *optional*, defaults to `(320, 640, 1280, 1280)`):
The tuple of output channels for each block.
layers_per_block (`int`, *optional*, defaults to 2):
Expand Down Expand Up @@ -107,6 +109,7 @@ class FlaxUNet2DConditionModel(nn.Module, FlaxModelMixin, ConfigMixin):
"DownBlock2D",
)
up_block_types: Tuple[str, ...] = ("UpBlock2D", "CrossAttnUpBlock2D", "CrossAttnUpBlock2D", "CrossAttnUpBlock2D")
mid_block_type: Optional[str] = "UNetMidBlock2DCrossAttn"
only_cross_attention: Union[bool, Tuple[bool]] = False
block_out_channels: Tuple[int, ...] = (320, 640, 1280, 1280)
layers_per_block: int = 2
Expand Down Expand Up @@ -252,16 +255,21 @@ def setup(self) -> None:
self.down_blocks = down_blocks

# mid
self.mid_block = FlaxUNetMidBlock2DCrossAttn(
in_channels=block_out_channels[-1],
dropout=self.dropout,
num_attention_heads=num_attention_heads[-1],
transformer_layers_per_block=transformer_layers_per_block[-1],
use_linear_projection=self.use_linear_projection,
use_memory_efficient_attention=self.use_memory_efficient_attention,
split_head_dim=self.split_head_dim,
dtype=self.dtype,
)
if self.config.mid_block_type == "UNetMidBlock2DCrossAttn":
self.mid_block = FlaxUNetMidBlock2DCrossAttn(
in_channels=block_out_channels[-1],
dropout=self.dropout,
num_attention_heads=num_attention_heads[-1],
transformer_layers_per_block=transformer_layers_per_block[-1],
use_linear_projection=self.use_linear_projection,
use_memory_efficient_attention=self.use_memory_efficient_attention,
split_head_dim=self.split_head_dim,
dtype=self.dtype,
)
elif self.config.mid_block_type is None:
self.mid_block = None
else:
raise ValueError(f"Unexpected mid_block_type {self.config.mid_block_type}")

# up
up_blocks = []
Expand Down Expand Up @@ -412,7 +420,8 @@ def __call__(
down_block_res_samples = new_down_block_res_samples

# 4. mid
sample = self.mid_block(sample, t_emb, encoder_hidden_states, deterministic=not train)
if self.mid_block is not None:
sample = self.mid_block(sample, t_emb, encoder_hidden_states, deterministic=not train)

if mid_block_additional_residual is not None:
sample += mid_block_additional_residual
Expand Down